extras:add gfid-to-dirname.sh

Backport of http://review.gluster.org/#/c/13797/

Add a script that converts the gfid-string of a directory into absolute
path name w.r.t the brick path.

Example:gfid-to-dirname.sh /home/ravi/bricks/brick1 e9c81321-f009-41b0-a009-cd77888c217e
Location of the directory corresponding to gfid:e9c81321-f009-41b0-a009-cd77888c217e is /home/ravi/bricks/brick1/d1/d2/d3/d4/d5/d6/d7/

Change-Id: I276ddf9c4f3d11a5b1932286d848b00b5ea1895d
BUG: 1320367
Signed-off-by: Ravishankar N <ravishankar@redhat.com>
(cherry picked from commit afbdcda3f4d6ffb906976064e0fa6f6b824718c8)
Reviewed-on: http://review.gluster.org/13812
Smoke: Gluster Build System <jenkins@build.gluster.com>
NetBSD-regression: NetBSD Build System <jenkins@build.gluster.org>
CentOS-regression: Gluster Build System <jenkins@build.gluster.com>
Reviewed-by: Pranith Kumar Karampuri <pkarampu@redhat.com>

1 files changed, 46 insertions, 0 deletions

diff --git a/extras/gfid-to-dirname.sh b/extras/gfid-to-dirname.sh
new file mode 100755
index 00000000000..fd359fab58a
--- /dev/null
+++ b/extras/gfid-to-dirname.sh
@@ -0,0 +1,46 @@
+#!/bin/bash
+
+function read_symlink()
+{
+        DOT_GLUSTERFS_PATH=$BRICK_PATH/.glusterfs
+        gfid_string=$1
+        symlink_path="$DOT_GLUSTERFS_PATH/${gfid_string:0:2}/${gfid_string:2:2}/$gfid_string"
+        #remove trailing '/'
+        symlink_path=${symlink_path%/}
+        linkname=$(readlink $symlink_path)
+        if [ $? -ne 0 ]; then
+                echo "readlink of $symlink_path returned an error." >&2
+                exit -1
+        fi
+        echo $linkname
+}
+
+main()
+{
+        if [ $# -lt 2 ] ;then
+                echo "Usage: $0 <brick-path> <gfid-string-of-directory>"
+                echo "Example: $0 /bricks/brick1 1b835012-1ae5-4f0d-9db4-64de574d891c"
+                exit -1
+        fi
+
+        BRICK_PATH=$1
+        name=$(read_symlink $2)
+        if [ $? -ne 0 ]; then
+                exit -1
+        fi
+
+        while [ ${name:12:36} != "00000000-0000-0000-0000-000000000001" ]
+        do
+                LOCATION=`basename $name`/$LOCATION
+                GFID_STRING=${name:12:36}
+                name=$(read_symlink $GFID_STRING)
+                if [ $? -ne 0 ]; then
+                        exit -1
+                fi
+        done
+
+        LOCATION=`basename $name`/$LOCATION
+        echo "Location of the directory corresponding to gfid:$2 is $BRICK_PATH/$LOCATION"
+}
+
+main "$@"